What does a type system for GUI widget design look like?
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Design systems are an interesting use case. A central design team makes widgets that follow a consistent design style, with accessibility support etc. and product teams then use that to build their stuff.
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A type system in this use case could help to support maintaining the APIs across teams, and helping upgrades across a large code base, but it doesn't replace good design sense. It can make thinking about affordances clearer perhaps.
Also could make generative testing of edge-case inputs easier. This could be used with a component browser to ensure that edge cases are properly handled (eg. exotic line directions, weird combinations of combining characters, etc). Might need to be manually verified though.
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But yeah, when you get into the nitty gritty of aesthetics, it begins to intertwine with the weird/messy API of the brain. Like with optical illusions for instance - like a circle and a square of the same dimensions won't look the same size, so you need to compensate.
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